I've had trouble with qcad losing my changes. I developed a drawing, saving every several seconds or so, printed the image to a file, saved again and quit. I just opened the file and most of my changes are gone. The dates on the printed file and the dxf file are a second or two apart. What could have happened to all my work?

Please note that there is a separate forum for the QCAD community edition. Please note also that there are various community edition compilations around from various Linux distributors and other individuals. They are all unsupported by RibbonSoft.